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| author | Ross Zwisler <ross.zwisler@linux.intel.com> | 2017-02-22 15:39:57 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-02-22 16:41:26 -0800 |
| commit | 653b2ea3396fda0b5e23a37b3356dd2ca82fe5c1 (patch) | |
| tree | 4f383b42124f84f8e8e6a3b319c61737e84e8974 /fs/dax.c | |
| parent | e057541acc173f44f191c8df68c75edc658f4688 (diff) | |
| download | lwn-653b2ea3396fda0b5e23a37b3356dd2ca82fe5c1.tar.gz lwn-653b2ea3396fda0b5e23a37b3356dd2ca82fe5c1.zip | |
dax: add tracepoints to dax_pmd_load_hole()
Add tracepoints to dax_pmd_load_hole(), following the same logging
conventions as the tracepoints in dax_iomap_pmd_fault().
Here is an example PMD fault showing the new tracepoints:
read_big-1478 [004] .... 238.242188: xfs_filemap_pmd_fault: dev 259:0 ino 0x1003
read_big-1478 [004] .... 238.242191: dax_pmd_fault: dev 259:0 ino 0x1003 shared ALLOW_RETRY|KILLABLE|USER address 0x10400000 vm_start 0x10200000 vm_end 0x10600000 pgoff 0x200 max_pgoff 0x1400
read_big-1478 [004] .... 238.242390: dax_pmd_load_hole: dev 259:0 ino 0x1003 shared address 0x10400000 zero_page ffffea0002c20000 radix_entry 0x1e
read_big-1478 [004] .... 238.242392: dax_pmd_fault_done: dev 259:0 ino 0x1003 shared ALLOW_RETRY|KILLABLE|USER address 0x10400000 vm_start 0x10200000 vm_end 0x10600000 pgoff 0x200 max_pgoff 0x1400 NOPAGE
Link: http://lkml.kernel.org/r/1484085142-2297-5-git-send-email-ross.zwisler@linux.intel.com
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/dax.c')
| -rw-r--r-- | fs/dax.c | 14 |
1 files changed, 10 insertions, 4 deletions
@@ -1299,33 +1299,39 @@ static int dax_pmd_load_hole(struct vm_area_struct *vma, pmd_t *pmd, { struct address_space *mapping = vma->vm_file->f_mapping; unsigned long pmd_addr = address & PMD_MASK; + struct inode *inode = mapping->host; struct page *zero_page; + void *ret = NULL; spinlock_t *ptl; pmd_t pmd_entry; - void *ret; zero_page = mm_get_huge_zero_page(vma->vm_mm); if (unlikely(!zero_page)) - return VM_FAULT_FALLBACK; + goto fallback; ret = dax_insert_mapping_entry(mapping, vmf, *entryp, 0, RADIX_DAX_PMD | RADIX_DAX_HZP); if (IS_ERR(ret)) - return VM_FAULT_FALLBACK; + goto fallback; *entryp = ret; ptl = pmd_lock(vma->vm_mm, pmd); if (!pmd_none(*pmd)) { spin_unlock(ptl); - return VM_FAULT_FALLBACK; + goto fallback; } pmd_entry = mk_pmd(zero_page, vma->vm_page_prot); pmd_entry = pmd_mkhuge(pmd_entry); set_pmd_at(vma->vm_mm, pmd_addr, pmd, pmd_entry); spin_unlock(ptl); + trace_dax_pmd_load_hole(inode, vma, address, zero_page, ret); return VM_FAULT_NOPAGE; + +fallback: + trace_dax_pmd_load_hole_fallback(inode, vma, address, zero_page, ret); + return VM_FAULT_FALLBACK; } int dax_iomap_pmd_fault(struct vm_area_struct *vma, unsigned long address, |